Concentrations

g / L

100

If 4 g of NaOH are dissolved in 2.0 L of water, what is the concentration in g/L?

2 g/L

200

What mass of salt is needed to make 500 mL of a 2 g/L solution? 

1 g of salt

300

If 0.004 kg of baking soda is dissolved in 1000 mL of water, what is its concentration in g/L? 

4 g/L 

400

When making homemade Kool-Aid, you accidentally put too much powder and you find the concentration to be very sweet in your 300 mL cup of water. You later realize you spilled 120,000 mg of powder! What is the concentration in g/L?

400 g/L

% m/V

100

How much % m/V is 20 g/L? 

2.0 % m/V

200

3.4 g of NaBr is dissolved in 200 mL of solution. What is the concentration in % m/V?

1.7 % m/V

300

How many grams of ethanol should be mixed with water to make 225 mL of a 4.5 % m/V mixture?

10.1 g

400

What is the concentration in % m/V of sulfuric acid when adding 3.4g to 3,500 mL of water? 

0.97 % m/V

ppm

100

2 g/L to ppm?

2000 ppm

200

150 g/L to ppm?

150,000 ppm

300

0.024 % m/V to ppm?

240 ppm

400

A 3000 L hot tub has a chloine concentration of 1 ppm. How many grams of chlorine are dissolved?

3 g

Units

100

1.234 kg to g

1234 g

200

12 g/L to % m/V

1.2 % m/V

300

0.0000046 kg to mg

4.6 mg

400

1000098 ppm to % m/V

100.0098

... or about 100 % m/V